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问题 选择题

小华从广州到西藏拉萨后，出现头晕、乏力、眼睛经常会发黑等一系列高原反应。主要原因是[ ]

A．温度太低，保暖不足

B．血液中的红细胞减少

C．营养补充不及时，能量不足

D．血红蛋白跟氧的结合减少

答案

答案：D

单项选择题

Due to a constAntly ______ environment， a poor understanding of the user’s needs and preferences，as well as a ______ of willingness to modify ______ organizational structures and decision models，the full economic potential of Web Information Systems(WIS) has not been realized by now. The data object types of the ______ meta model，the Extended World Wide Web Design Technique(eW3DT)，provide hypertext designers ______ a conceptual，user-centric framework and graphical notation for the construction of both，______ and customized models， during the software development ______ of commercial WIS. A reference model as a normative concept represents an abstraction of a ______ company，its functional units， or its(Web) Information System and is intended to streamline the design and implementation of complex applications at ______costs. As precondition for pursuing a partial globalization strategy，eW3DT ______ between technical and content-specific responsibilities for designing， implementing， and maintaining WIS.

A．give

B．above

C．presented

D．got
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多项选择题

消防车按主要结构特征不同，可分为（）消防车。

A.罐类

B.特种类

C.举高类

D.泡沫类

E.抢险类
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